A heat dome occurs when a persistent region of high pressure traps heat over an area.
The heat dome can stretch over several states and linger for days to weeks, leaving the people, crops and animals below to suffer through stagnant, hot air that can feel like an oven., a band of fast winds high in the atmosphere that generally runs west to east.north and then south and then north again. When these meanders in the jet stream become bigger, they move slower and can become stationary. That's when heat domes can occur.
, and the sinking air also keeps skies clear since it lowers humidity. That allows the Sun to create hotter and hotter conditions near the ground.This downslope warming played a large role in the extremely hot temperatures in the Pacific Northwest during a , when Washington set a state record with 120 degrees Fahrenheit , and temperatures reached 121° Fahrenheit in British Columbia in Canada, surpassing the previous Canadian record by 8° Fahrenheit .Heat domes normally persist for several days in any one location, but they can last longer.in Texas and Mexico was forecast to expand deeper into the Southwest and South Central U.S.
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